3361 Orpheus (1982 HR)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3231610634 ± 2.00e+00
Semi-major axis (a)1.2101508924 AU ± 3.00e+00
Inclination (i)2.65169834° ± 4.00e+00
Long. of Asc. Node (Ω)188.44299382° ± 5.00e+00
Arg. of Perihelion (ω)302.64499143° ± 6.00e+00
Mean Anomaly (M)320.54810304° ± 1.29e-06
Mean Motion (n)0.7403771180°/day ± 2.75e+00
Perihelion dist (q)0.81907724 AU ± 3.16e+00
Aphelion dist (Q)1.60122454 AU ± 4.65e+00
Orbital Period1.33124898 yr ± 4.95e+00
NGA Modelr2
A22.56523269e-06 AU/d²
Physical Parameters
H (abs. magnitude)19.50
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-26
RMS Residual0.382″
Uncertainty0
Orbit TypeApollo
MOID0.014472 AU
Observations Used3021
Oppositions11
Arc Total1982-2025
First Observation Used1982-04-24
Last Observation Used2025-11-19
Observations (4857)
Date Type RA Dec Mag Band Observatory
2021-10-21 11:43:56 s 1 -140787.16 3 +274666.74 7300.0 C57
2021-10-21 11:53:56 S 02 52 20.525 +09 33 18.36 V C57
2021-10-21 11:53:56 s 1 -141043.68 2 +274189.84 5180.0 C57
2021-10-21 12:03:56 S 02 52 20.568 +09 33 04.21 V C57
2021-10-21 12:03:56 s 1 -141299.53 7 +273711.63 630.0 C57
2021-10-21 12:13:56 S 02 52 20.746 +09 32 51.22 V C57
2021-10-21 12:13:56 s 1 -141554.72 4 +273232.12 3650.0 C57
2021-10-21 12:23:56 S 02 52 20.741 +09 32 38.40 V C57
2021-10-21 12:23:56 s 1 -141809.24 0 +272751.31 4230.0 C57
2021-10-21 12:33:56 S 02 52 20.854 +09 32 25.69 V C57
2021-10-21 12:33:56 s 1 -142063.08 1 +272269.19 2360.0 C57
2021-10-21 12:43:56 S 02 52 20.918 +09 32 12.44 V C57
2021-10-21 12:43:56 s 1 -142316.24 6 +271785.77 8020.0 C57
2021-10-21 12:53:56 S 02 52 21.014 +09 31 57.65 V C57
2021-10-21 12:53:56 s 1 -142568.70 4 +271301.05 1270.0 C57
2021-10-21 13:03:56 S 02 52 21.098 +09 31 47.78 V C57
2021-10-21 13:03:56 s 1 -142819.18 6 +270815.20 5490.0 C57
2021-10-21 13:13:56 S 02 52 21.190 +09 31 32.99 V C57
2021-10-21 13:13:56 s 1 -143070.38 1 +270327.85 3470.0 C57
2021-10-21 13:23:56 S 02 52 21.319 +09 31 19.67 V C57
2021-10-21 13:23:56 s 1 -143320.80 3 +269839.19 9170.0 C57
2021-10-21 13:33:56 S 02 52 21.408 +09 31 06.53 V C57
2021-10-21 13:33:56 s 1 -143570.53 3 +269349.23 2340.0 C57
2021-10-21 13:43:56 S 02 52 21.439 +09 30 54.25 V C57
2021-10-21 13:43:56 s 1 -143819.56 6 +268857.95 2980.0 C57
2021-10-21 13:53:56 S 02 52 21.497 +09 30 40.61 V C57
2021-10-21 13:53:56 s 1 -144067.90 0 +268365.36 1080.0 C57
2021-10-21 14:03:56 S 02 52 21.694 +09 30 26.50 V C57
2021-10-21 14:03:56 s 1 -144315.53 2 +267871.45 6620.0 C57
2021-10-21 14:13:56 S 02 52 21.761 +09 30 13.64 V C57
2021-10-21 14:13:56 s 1 -144562.45 8 +267376.22 9600.0 C57
2021-10-21 14:23:56 S 02 52 21.799 +09 30 02.02 V C57
2021-10-21 14:23:56 s 1 -144808.67 4 +266879.67 0.0 C57
2021-10-21 14:33:56 S 02 52 21.852 +09 29 48.95 V C57
2021-10-21 14:33:56 s 1 -145054.17 9 +266381.81 7810.0 C57
2021-10-21 14:43:56 S 02 52 21.982 +09 29 36.10 V C57
2021-10-21 14:43:56 s 1 -145298.96 7 +265882.62 3020.0 C57
2021-10-21 14:53:56 S 02 52 22.099 +09 29 21.84 V C57
2021-10-21 14:53:56 s 1 -145543.03 7 +265382.11 5630.0 C57
2021-10-21 15:03:56 S 02 52 22.130 +09 29 08.74 V C57
2021-10-21 15:03:56 s 1 -145786.38 4 +264880.27 5600.0 C57
2021-10-21 15:13:56 S 02 52 22.390 +09 28 55.92 V C57
2021-10-21 15:13:56 s 1 -146029.00 6 +264377.11 2950.0 C57
2021-10-21 15:23:56 S 02 52 22.327 +09 28 42.71 V C57
2021-10-21 15:23:56 s 1 -146270.89 8 +263872.62 7640.0 C57
2021-10-21 15:33:56 S 02 52 22.558 +09 28 28.92 V C57
2021-10-21 15:33:56 s 1 -146512.05 8 +263366.80 9680.0 C57
2021-10-21 15:43:56 S 02 52 22.462 +09 28 17.00 V C57
2021-10-21 15:43:56 s 1 -146752.48 2 +262859.66 9050.0 C57
2021-10-21 15:53:56 S 02 52 22.673 +09 28 03.86 V C57
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2021-11-13 07:00:00 55352696.248 1 us 8560 -14 -14
2021-11-14 05:40:00 52231075.023 1 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)